I had the same question as I have a 1800x comin at me and want to use the RGB water block . I asked them this question on FB today." Does the Thermaltake Pacific W4 RGB CPU Water Block support AM4??
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Thermaltake Technology Inc We will have an announcement regarding this issue soon"
EK does have compatible blocks so that is an option if you are in a time pinch. I might go that way if this announcement is not in a day or so.